Improvement in machines for making excelsior



W. H. MAYO.

Improvement in Machines for Making Excelsior.

N0.128,970. PatentedJu|y16,1 872.

)Kdlux R, 7 I Q7 1M PHM'O unmeunnc c0. 1/. x Inseam/5S PRocsssJ UNITEDSTATES WILLIAM H- MAYO, OF ORONO, MAINE, ASSIGNOR TO sronE,

- a 00., 0E sAME PLACE.

PATENT O FIo MAYO, snow IMPROVEMENT IN MACHINES FOR MAKING EXCELSIOR.

Specification forming part of Letters Patent No. 128,970, dated July 16,1872.

To all whom it may concern:

Be it known that I, WILLIAM H. MAYO, of Orono, in the county ofPenobscot and State of Maine, have invented a new and useful Improvementin Machines for Making Excelsior, and I hereby declare the following tobe a full, clear, and exact description of the same, which will enableothers to make and use my invention, reference being had to theaccompanying drawing forming a part of this specification, in whichFigure 1 shows a front elevation; Fig. 2, section of the knife-plate; A,B, G, 1), and E, details of various parts.

Same letters show like parts.

The object of my invention is the production of an excelsior machinewhich shall be simple in construction and operation.

Reference to the drawing will explain my invention. At a is the frame ofthe machine. b b show slides upon which moves a knifeplate, 0, in whichare secured knives d e. The upper knife (1 is fiat, and of ordinaryconstruction. The lower knife 6 is triangularly serrated upon its uppersurface by triangular grooves, ff, forming in fact a series oftriangular cutters. (For perspective and crosssection of this knife 6,see details A and B, respectively.) 9 is the bar upon which the boltrests, secured by any of the usual devices. The knife-plate 0 receives areciprocating motion through a connecting-rod h, crank 11, and pulley j,or similar devices.

The operation of the machine is as follows: Suppose the bolt to be inplace on the bar g, and the knives raised, as shown, preparatory tomaking a cut. The lower triangularly-serrated knife e first strikes thebolt and removes from it triangular shavings, 1 l 1, (see detail D ofbolt,) making excelsior, which is triangular in transverse section, (seedetail E,) and leaving the bolt scored out, as shown at D. The upperknife d following it and making a straight cut, (see dotted line w 00,)removes triangular shavings 2 2, thus, also, producing triangular-shapedexcelsior, and leaving the face of the bolt smooth for the next out.

them.

The knife-plate c has within its face a groove, K, in which is a slide,lm, which keeps the knives, from contact with the bolt on the returnstroke, thus keeping them sharp and preventing dust.

Its operation is as follows: It is made thickor at the end 1 than at theend m, and when in the position shown at rin detail 0 this thicknessprojects beyond the surface of the knife plate, and beyond the edges ofthe knives. It assumes this position at the end of the down stroke,actuated by an inclined plane, a, in the bar g, against which itstrikes, so that on the up-stroke the bolt rubs against this slidewithout striking the knife-edges. At the end of the up-stroke it strikesagainst a second inclined plane, 0, and is by it forced into theposition q, in which its surface is flush with that of the knife-plate,allowing the knife-edges to act upon the bolt.

The peculiar product of my machinei. 6., an excelsior, triangular intransverse sectionpossesses certain advantages over the flat excelsiornow used. Its peculiar shape gives it more elasticity and an increasedtendency to curl, while by doing away with the slitters commonly used,the product is more free from dust.

What I claim as my invention, and desire to secure by Letters Patent,is-- 1. The combination, in an excelsior-machine, of the straight knife01 and triangularly-serrated knife, operating substantially as hereinset forth and specified.

2. In combination with the reciprocating knife-plate c, the slidel m,and inclined planes, n 0, arranged substantially as described, andoperating alternately on said slide, as specified.

WM. H. MAYO.

Witnesses H. HUTGHINSON, G. H. Snow.

